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10.3 Electrical energy and power

10.3 Electrical energy and power

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Question 21

An engineer is designing a high-efficiency heating element for an electric vehicle cabin heater. To optimize the rate of electrical energy transfer (electrical power, PPP), they must use correct mathematical relationships.

Which row of the table shows two correct equations that can be used to calculate the electrical power P P\,P dissipated by a heating element of resistance RRR?

Equation 1Equation 2
AP=V2RP = V^2 RP=V2RP=I2R\displaystyle P = \frac{I^2}{R}P=RI2​
BP=V2R\displaystyle P = \frac{V^2}{R}P=RV2​P=I2RP = I^2 RP=I2R
CP=RV2\displaystyle P = \frac{R}{V^2}P=V2R​P=I2RP = I^2 RP=I2R
DP=V2R\displaystyle P = \frac{V^2}{R}P=RV2​P=IR2P = I R^2P=IR2
A

Row A

B

Row B

C

Row C

D

Row D

Markscheme

10.3 Electrical energy and power Questions

  1. GCSE
  2. /Physics
  3. /10.3 Electrical energy and power

31 exam-style questions on Edexcel GCSE Physics 10.3 Electrical energy and power. Each one has a worked solution and a mark scheme showing where the marks go.

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